Why would they make it up? They've clearly spoken to her and the 28 minutes thing is pretty specific.
As referred to earlier, they've had an amazingly bad track record when it comes to predictions for this sort of thing and, in particular, 'Doctor Who
It's usually something they've either picked up from trawling forums for speculation or an off-hand quote spoken in jest which they interpret literally and claim it's exclusive.
That already seems to be the case with the character name they quote.
Take everything in this with a huge pinch of salt, unless a direct quote.
I also doubt the actress would be allowed to say such a thing or, more importantly, would be able
to: She wouldn't have seen the final cut yet and wouldn't know how long the edited scenes are.